Knowing what a tax law charges is only half the picture. Something else has to say how registration, filing and penalties actually work, and that is this Act's job.
What the Act covers
The Nigeria Tax Administration Act 2025 is Act No. 5 of 2025. Where the Nigeria Tax Act sets out rates and definitions, this Act governs the process around them, covering registration, returns, penalties and interest for the Nigeria Tax Administration Act 2025.
It reaches beyond the Nigeria Revenue Service (NRS), formerly FIRS, alone. Its rules apply to federal and state tax authorities together, which is part of why the Joint Revenue Board exists to coordinate between them.
How it differs from the Nigeria Tax Act
Think of the two Acts as what and how. The Nigeria Tax Act answers what is taxed and at what rate. This Act answers how that tax is registered, reported, paid late, or missed entirely, and what follows from each.
Both commenced on the same day, 1 Jan 2026, so neither one operated without the other from day one.
The duty to register
The Act states plainly that every taxable person must register and get a Tax ID. This is where the Tax ID comes from in practical terms. Registration is what a Tax ID confirms has happened.
Skipping registration is not a quiet option. The Act sets a penalty of ₦50,000 for the first month unregistered, a separate charge from any penalty tied to a specific return.
The duty to file every year
The annual return duty is the part that catches out businesses with nothing to report. Every taxable person must file a return each year, even if no tax is due.
A small company exempted from company income tax is not exempted from this duty. Our look at the small-company exemption covers exactly where that line sits.
What happens if you ignore it
A late or missing return carries a specific cost under this Act, starting at ₦100,000 for the first month. The figure is set out clearly enough that there is no need to guess at it.
Beyond a single return, the Act also treats unregistered status and poor record-keeping as their own separate failures, each with its own penalty rather than one blanket fine covering everything.
Interest as a third layer
Penalties are not the only cost the Act sets out. Interest on tax paid late sits alongside them as a separate charge, reviewed periodically rather than fixed once and left alone.
Treating a penalty as the full cost of falling behind understates the real number once interest is added on top. The two are calculated separately, and both start from the same missed deadline.
Common mistakes
- Treating "no tax due" as "no return due". The two are separate duties under this Act, and only one of them depends on how much you owe.
- Assuming a late registration and a late return carry the same penalty. They are charged separately, under different provisions of the same Act.
- Looking for penalty rates in the Nigeria Tax Act. Rates for what is taxed sit there; penalties for how you comply sit here.
For the exact figures a late return costs, see our breakdown of the late-filing penalty. For the wider changeover this Act sits inside, read our full account of the tax authority's rename and browse the NRS and Rev360 hub.